Diamond-polishing dop



(mmel') EDWARD & ERNEST'LOESSER.

DIAMOND POLISHING DOP No. 573,672. Patented Dec. 22, 1896.

llVI/E/VT 0195 m 'gr oer/Era UNITED STATES PATENT OFFI E.

EDl/VARD LOESSER AND ERNEST LOESSER, OF NEW YORK, N. Y., ASSIGNORS OFFOUR- TINTHS TO LEON DREYFUS, OF SAME PLACE, AND RICHARD LOESSER, OFBROOKLYN NEW YORK.

DIAMOND-POLISHING DOP.

SPECIFICATION forming part of Letters Patent No. 57' 3,672, datedDecember 22, 1896.

Application filed July 24,1896- Serial at. 600,429. No model.)

T aZZ whom it may concern:

Be it known that we, EDWARD LOESSER and ERNEST LOESSER, citizens of theUnited States, residing in the city, county, and State of New York,haveinvented certain new and useful Improvements in Diamond-Polishing Dops,of which the following is a Specification.

This invention relates to a dop for diamond-polishing tools, and theobject of the invention is to provide a dop in which the diamond can bereadily and quickly adjusted for polishing off the facets, table, orculet.

In the accompanying drawings, Figure l is a side elevation of ourimproved diamondpolishing dop. Fig. 2 is a longitudinal section thereof,partly broken. Fig. 3 is an end elevation of the dop. Fig. 4 is asimilar elevation with the holding-finger removed. Fig. 5 is a detachedperspective view of one of the removable shoes or seat portions. Fig. (5is a side elevation of a dop in accordance with our invention modifiedso that it is adapted to the polishing ofi of the tables or culets,which are, as is known, arranged at right angles to the axis of thediamond; and Fig. 7 is a sectional view of a modification of the shoe orseat.

Referring to the drawings, A indicates the head of the dop, which may beof suitable o material, such as brass, and B indicates the shank of thedop, which is to be inserted into the diamond-polishing tool. The dopshown in Figs. 1 to 4, inclusive, has a fin A, the edge of which isinclined and is provided with a recess a of suitable conformation so asto receive the corresponding lug or flange O of a removable shoe 0,which is provided with a cavity 0 (See particularly Fig. 5.) Theinclination of the fin causes the shoe 0 to be inclined, and theinclination of the shoe depends upon the inclination of the facets whichare to be polished oif.

The shoe 0 may be secured in position by means of a suitable fastening,but it is preferably arranged loosely in the recess a of the head of thedop, inasmuch as said shoe is retained in position by means of aholdingfinger D in connection with the diamond X retained thereby. Thisholding-finger D is provided at its outer end with a fork or bifurcationcl for receiving and fitting upon the diamond or other precious stone,and at its other end with a shank D, which is arranged at right anglesto the finger. The shank D of the finger is inserted in a bore 6 in thehead of the dop, and is secured and retained adj ustably therein bymeans of a set-screw e, screwed into a correspondingly screw-threadedbore e at right angles to the bore e, so that when the diamond isarranged in proper position the set-screw 6 will firmly engage the shankD of the holding-finger D, and the diamond. will be retained through themedium of the bifurcated end d of the finger and the cavity in the shoe(3, whereby said shoe is firmly retained in position, and the diamond issecurely retained by three points of contact, respectively, the twobifurcations of the bifurcated end (Z of the finger and the seat orcavity C The form of dop described is for the purpose of polishing ofithe facets, and for that reason the seat against which the diamond isheld is arranged on an incline, so that the facet of the diamond whichis being polished off will be at right angles to the axis of the dop.When one facet has been properly polished off, it is a question of onlya moments time to loosen the set-screw e by means of a suitable key,raise the finger D, and adjust the diamond X by turning it until thenext facet is exposed, when the finger is again set against the diamondby means of the screw e,and the polishing proceeds in the usual manner,the diamond-polisher determining the an- 8 5 gle and amount of polishingrequired by the eye. It is evident that this quick adjustment and set ofthe diamond is of the utmost im- 'portance to the diamond-polisher, asit saves incline thereto, as when the tool is to be used for polishingoff the facets. In this case the shank D of the holding-finger isinserted in a bore of the dop which is parallel with the shank Bthereof, while the set-screw 6 extends into a bore arranged at rightangles to the shank B of the dop.

For accommodating diamonds of difierent sizes the shoes 0, provided withthe seats C are removable and interchangeable, each being provided witha cavity or seat 0 of different size from the others. Ordinarily theholding-finger is of sufficient dimensions, but difierent sizes of thesemay also be provided.

The flange C of the shoe 0 is preferably angular in shape and rests atits inner end against the inner end of the recess, which forms anabutmentoperating in connection with the inner face of the shoe itselfagainst the body of the head and the pressure of the holding-fingerDthrough the diamond to hold the shoe firmly in place, and yet it isfreely removable when the diamond is taken out.

Instead of the shoe 0 a conical hollow plug 0 having a cavity or seat Omay be inserted in a corresponding socket in the head of the dop.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent 7 1. A diamond-polishing dop, comprising ahead, means for applying the same to a diamond-polishing tool, aholding-finger provided with a recessed end by which it is securedagainst a point of contact on the head of the dop, and means forsecuring and adjusting the holding-finger, substantially as set forth.

2. A diamond-polishing dop, comprising a head provided with an inclinedseat and having means for applying it to a diamond-polishing tool, abifurcated holding-finger adapted, in connection with said seat, toestablish three points of contact with the diamond, and means forsecuring and adjusting the holdingfinger, substantially as set forth.

3. A diamond-polishingdop, comprising a head having a recess andprovided with means for application to a diamond-polishing tool, aremovable shoe having a flange fitting said recess and provided with acavity, and means for engaging the diamond and holding the same in thecavity of said shoe.

In testimony that we claim the foregoing as our invention we have signedour names in presence of two subscribing witnesses.

EDWARD LOESSER. ERNEST LOESSER.

Witnesses: Y

GEO. L. WHEELOCK, GEO. W. JAEKEL.

